static void Main(string[] args)
{
ClockWithCountdown clock = new ClockWithCountdown();
Subscriber s1 = new MillisecondsCounter();
Subscriber s2 = new SecondsCounter();
Subscriber s3 = new MinutesCounter();
s1.Register(clock);
s2.Register(clock);
clock.Countdown(1000);
s3.Register(clock);
clock.Countdown(5000);
s2.Unregister(clock);
s1.Unregister(clock);
clock.Countdown(3000);
s3.Unregister(clock);
Console.ReadLine();
}
/// <summary>
/// Unregisters the specified Subscriber.
/// </summary>
/// <param name="clock">The clock.</param>
public void Unregister(ClockWithCountdown clock)
{
clock.ClockCountdown -= Message;
Console.WriteLine($"The subscriber {GetType()} unregistered.");
}
